Re: Dynamic package version numbers with Autoconf and Automake

[Bob Friesenhahn]

On Wed, 15 Aug 2012, Miles Bader wrote:
> (3) The final version info is updated (using VCS info and/or autoconf
>    version info) at make time using a script, and when it changes,
>    only causes a source file (e.g., version.c) to change.
>
>    This means that although some things are rebuilt after a commit
>    (version.o, and relinking of any binaries that use it), the amount
>    of rebuilding is relatively minor while still yielding accurate
>    info.

Likewise, GraphicsMagick configures a "version.h" as well as a version 
file used for non-autotools builds under Windows.  With the currently 
used mechanism, only the few files depending on version.h need to be 
rebuilt but the whole project relinks.

If the project "config.h" was to be re-generated (seems to be 
necessary with new AC_INIT), then all of the source modules would need 
to be recompiled and relinked since everything depends on the 
configuration header.

Bpb
--
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/